Grinding wheel



Nov. 19, "1929.

W. LE R. BRYANT GRINDING WHEEL Original Filed Jl'lly 20, 1921 PatentedNov. 19, 1929 WILLI M LE ROY BRYANT, or srnnverrnrn, VERMONT GRINDINGWHEEL Original application filed Jul 20, 1921, Serial no. 486,080.Divided and this application filed December w l 26, 1925; Serial No.77,838. Y i

This invention relates to grinding wheels and is divided from myapplication Serial No. 486,080, filed July 20, 1921, and entitledGrinding machine, which application issued as Patent No. 1,575,968, onNovember 9, 1926. An object of this invention is to provide a grindingwheel capable of grindmg n one operat1on bars having d1fferent contoursor portions of different diameters. 3-0 This requires a wheel with abroad face which may be the surface of a single abrasive "memher or of anumber of members held side by side. The use of such wheels avoidshandling the work more than once for-the grinding operation, and ensuresaccurate concentricity of different portions of thebar, which is notassured when the" bar is subjected to; successive grinding operations.The use of broad face grinding wheels, either of the same or differentdiameters,also offers advantages in both increased 7 output and greateraccuracy in production; This is ac"- counted for 011 the score ofincreasedproduction by the use of wheels with grinding faces 5approximating the length of the work to be ground, so that an equalamount of stock may be removed simultaneously the full length of thework. It is apparent that the same amount ofmetal can thus be morequickly so removed than in the'useofa narrow'grinding face ordinarilyemployecL-which must be arranged to travel back and forth across thework to be ground at such length as is required to cut over the'entirelength of the work. This advantage applies both to the finishing of along single diameter 'andto'a combination of different diameters, but,in finishing pieces of different diameters, an added advantage isobtained from the'fact 40 that the several diameters or sizes may befinished at one opratiomthereby efiecting the saving of the timerequired to change the pieces from one machine to another, or, if oneoperation follows another in the same machine, the elimination ofmakingof necessary adjustments on the grinding machine. There is also anadvantage in accuracy in the finishing of several diameters at oneoperation, in that all surfaces thus finished are concentric and truewith each other, a condition which 56 mayor may not be so,jas the workis moved in and out of the machine in making the several operations oneat a time; Even though a bar is to be ground so as toghave the samediameter from end to end, I find it desirable 5 to employ a sectionalgrinding'wheel, as the reciprocation of the work makes it possible toprevent the formation of corrugations {or irregularities on theperiphery of the work.

7 By employing relatively narrow sections, they can be combinedtogether'in axial relation to produce a grindingtoolhaving the breadthof face desired. For instance, in'the grinds ing' of a bar oftwelve-inch length,I may use; 7 a

six two-inch width wheels clamped together, or four three-inch wheelsmounted side .by side. The use 'of a limited reciprocation orlongitudinal traverse for the work carrier permits the use of a wheel somounted, asthe side motion of the work serves to eliminate 2 any marksthat might be made by the'joints in the grinding wheels; An economicadvantage is secured in the use of narrow Wheels in making up abroadface, on the scoreiof its being unnecessary to keep" instockl wheels ,to

cover alvariety of lengths'ofworkf For in- V stance, if there werepieces six inch, eightinch, ten-inch and twelve-inch length to be groundindifferent lots, by using one broad wheel. it would benecessaryto'carry a wheel for each length. By the use of the narrow,wheels, say of two-inch and three-inch width, acombination of differentwidths can be used a "to make up the total length needed, making a greatdeal smaller the wheel investment re- 1 V out, than by the use of onewheel of greater face and area.

In the drawings, Fig. 1 represents a longitudmal section through oneform of my improved grinding wheel and apart of the mechanism supportingthe same ;v

Fig. 2 represents 1n longitudinal section a 7 portion of a grindingwheel having a single Referring to Fig. l in detail, the shaft 65:

Whichcarries and turns the grinding-wheel is journalled in a bushing 76set-in a car riage, portions of which areindicated at75 and 78. Suitableducts are provided to ensure proper lubrication of the bearings. At

one end the grinding wheel shaft is provided with a flange 83 and areduced portion 84 to which the hub of the grinding wheel may beremovably bolted or'otherwise 'secured. Preferably the machine isprovided with a plurality of interchangeable grinding wheels foroperatingupon work of different kinds. Each wheel may with conveniencecomprisea hub 85 having an internal projecti ing flange 86 which may bebolted or otherwise secured to the flange 83 of the shaft 65. Theflange.86 encircles the reduced end 84 of the shaft, and between them isplaced a hardened steel bushing 87. The'hub of the grinding wheel maywith convenience be made of. aluminum or other suitable material.

I The grinding wheel proper, or that portion which is employed forgrinding the work, is

annular and is clamped between an undercut flange 88 projecting radiallyfrom the hub and a removable clamping-memberv 89, which is likewiseundercut and which is secured to the face of the hubby screws 90; In theform' shown in Fig. '1, I provide three grinding or abrading members 91,92, 93,

all of which are of different diameters and which maybe of differentkinds of grinding material if desired. .Between these members areprovided additional spacing and clamping members 94, 95. The flange 88,the clamp 89, andthe spacers 94, 95, form dove-tail V annular groovesinto which complemental portions of the abrading or grinding mem- 'bersare clamped. The dove-tail construction enables the clamping and spacingrings 94, 95. to grip the inner portions of the rings in such a way asto, anchor each portion of the IIP against radial motionand thus tooppose positively'centrifugal reaction on the rings regardless of theintegrity of the rings.

Unless so anchored, each portion of a ring depends on tensile strengthof all the rest of the rlng, and if the ring is cracked or weak in oneplace, it is liable to fly in pieces from the hub when rotated atgrindingspeeds. In Fig. 2, I have shown the hub 85 as provided with asingle abrading or grinding member 96 which is provided with acylindrical exterior of the same diameter from end to end. Itwill beobserved that in this case the member is of such axial length that itprojects to some extent beyond the end ofthe hub, and consequently Iemploy a clamp 97 having an elongated hub portion 98 to accommodate theabrading or grinding member. Instead of a rality of disks 96 ofequaldiameter may be employed, as indicated in Fig. 3. These grindingmembers may take different forms according tothe character of theoperation to be accomplished. In Figs. 3 to -6,'inclu sive, I have shownportions of different grinding members which may be utilized. Inaddition to those shown in'Figs'.-3 and 4, I have shown one member 99,in Fig. 5, which is double tapered, and another member 100, in Fig.6,the face of which is concave. From these Figs. 3 to 6, inclusive, itwill be seen that, by. these respective grinding or abrading members,the work may be finished or ground in different forms.

Referring once more to Fig. 1, it will be observed that the grindingwheel, considered as a whole, is enclosed within a water guard 101 whichrests upon a straight flange 102 formed on the portion 7 8 of thecarriage. As a matter of construction, anti-frictionballs 107 maybelocated between the guard 101 and the flange 102 to support the weightof the guard and make it easy to adjust the guard. The guardis providedwith a face cover 108. The construction and arrangement of these andother related parts ofthe grinding machine are fully described in myapplication Serial No. 486,080, previously referredto. r

'WhatIclaim is: r Y 1. A- grinding wheel" comprisinga hub having anundercut peripheral flange and an undercut clamping member, undercutspacing rings on said hub between said flange andclamping member,forming therewith a plurality of dove-tail3groove's, and a plurality ofabrasive rings or seotionshaving' (TOY/84133111 innerportlonsfcomplemental to and clamped in said grooves.

2. A' grinding wheel comprlsinga hub having at one end an undercutperipheral single cylindrical abrading member 96, a pluflange,a-clamping member at the. otherend thereof constituting a continuationof 'said 7 hub and having anundercutperipheralflange, I r Y a pluralityof abrasive rings undercutto form dove-tail 1nner POItlOIlSSBZLtGd onsaid rings seated on said hub between conse'ctive abrasive rings, saidlocking rings being complemental to said dove-tail inner I hub andclamping-member, and locking l signature.

3. A grinding Wheel comprising a hub, a plurality of abrasive ringsmounted on said hub, and locking rings loosely mounted on said hub andclamped between successive abrasive rings for positively opposingcentrifugal reaction on each portion of said abrasive rings. I Intestimony whereof I have affixed by WILLIAM LE ROY BRYANT.

